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Factors Affecting Prenatal Development

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Factors affecting pre-natal development a. Maternal Health Since the placenta cannot filter out extremely small disease carriers, such as viruses, children can be born with malaria, measles, chicken pox, mumps, syphilis, or other venereal diseases that have been transmitted from the mother. Rubella is the most widespread of the viruses that have a teratogenic effect. If a pregnant woman contracts rubella in the first three months of pregnancy, she is likely to give birth to a child with a congenital abnormality such as heart disease, cataracts, deafness, or mental retardation. Interestingly, there is not a direct relationship between the severity of the disease in the mother and its effect on the fetus. For example, women who …show more content…

c. Drugs Chemicals (over-the-counter and prescribed pharmaceuticals as well as illegal substances) can cause a wide range of congenital abnormalities that account for about 10 percent of birth defects. The severity of the abnormality depends on the amount of the chemical the mother is exposed to, the developmental stage of the fetus, and the period of time over which the mother's exposure to the chemical takes place. In terms of narcotics, women who are addicted to heroin, morphine, or methadone give birth to addicted babies. Soon after birth, the babies show symptoms of withdrawal, including tremors, convulsions, difficulty breathing, and intestinal disturbances. d. Tobacco Maternal smoking increases the risk of spontaneous abortions, bleeding during pregnancy, premature rupture of the amniotic sac, and fetal deaths and deaths of newborns. Women who smoke during pregnancy give birth to babies who are about one-half pound (225 grams) lighter (on the average) and smaller in all dimensions (for example, length and head circumference) than babies of non-smokers, are born prematurely, and have other health problems. e. Alcohol The effects of alcohol are almost undisputed. Fetal alcohol syndrome (FAS), identified in 1973, is perhaps one of the best known and best documented outcomes of drinking, affecting approximately one out of every 750 births. And it is not just the heavy drinker who may place her fetus in danger. It has

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